SurveyElement

A base class for all survey elements.

Inherited from the following class(es):

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	clone method
	Creates a new object that has the same type and properties as the current SurveyJS object. Type: () => Base Implemented in: Base
	collapse method
	Collapses the survey element. In collapsed state, the element displays only `title` and `description`. Type: () => void Implemented in: SurveyElement See also: title * , description * , state * , toggleState * , expand * , isCollapsed * , isExpanded
	containsErrors property
	Returns `true` if the survey element or its child elements have validation errors. This property contains the result of the most recent validation. This result may be outdated. Call the `validate` method to get an up-to-date value. Type: boolean readonly Implemented in: SurveyElement See also: errors
	cssClasses property
	Returns an object in which keys are UI elements and values are CSS classes applied to them. Use the following events of the `SurveyModel` object to override CSS classes: `onUpdatePageCssClasses` `onUpdatePanelCssClasses` `onUpdateQuestionCssClasses` Type: any readonly Implemented in: SurveyElement
	description property
	Explanatory text displayed under the title. Type: string writable Implemented in: SurveyElementCore See also: hasDescription
	errors property
	Validation errors. Call the `validate()` method to validate survey element data. Type: SurveyError[] writable Implemented in: SurveyElement See also: validate
	expand method
	Expands the survey element. Type: () => void Implemented in: SurveyElement See also: state * , toggleState * , collapse * , isCollapsed * , isExpanded
	fromJSON method
	Assigns a new configuration to the current SurveyJS object. This configuration is taken from a passed JSON object. The JSON object should contain only serializable properties of this SurveyJS object. Event handlers and properties that do not belong to the SurveyJS object are ignored. Type: (json: any) => void Parameters: json, type: any , A JSON object with properties that you want to apply to the current SurveyJS object. Implemented in: Base See also: toJSON
	getLocale method
	Returns the survey's locale. If a default locale is used, this method returns an empty string. To get the applied locale in this case, use the following code: `import { surveyLocalization } from 'survey-core'; const defaultLocale = surveyLocalization.defaultLocale;` Type: () => string Implemented in: SurveyElement See also: Localization & Globalization
	getPropertyByName method
	Returns a `JsonObjectProperty` object with metadata about a serializable property that belongs to the current SurveyJS object. If the property is not found, this method returns `null`. Type: (propName: string) => JsonObjectProperty Parameters: propName, type: string , A property name. Implemented in: Base
	getPropertyValue method
	Returns the value of a property with a specified name. If the property is not found or does not have a value, this method returns either `undefined`, `defaultValue` specified in the property configuration, or a value passed as the `defaultValue` parameter. Type: (name: string, defaultValue?: any) => any Parameters: name, type: string , A property name. defaultValue, type: any , (Optional) A value to return if the property is not found or does not have a value. Implemented in: Base
	getType method
	Returns the object type as it is used in the JSON schema. Type: () => string Implemented in: Base
	hasDescription property
	Returns `true` if the survey element has a description. Type: boolean readonly Implemented in: SurveyElementCore See also: description
	indent property
	Increases or decreases an indent of survey element content from the left edge. Accepts positive integer values and 0. Does not apply in the Default V2 theme. Type: number writable Implemented in: SurveyElement See also: rightIndent
	inSurvey property
	Returns `true` if the object is included in a survey. This property may return `false`, for example, when you create a survey model dynamically. Type: boolean readonly Implemented in: Base
	isCollapsed property
	Returns `true` if the survey element is collapsed. Type: boolean readonly Implemented in: SurveyElement See also: state * , toggleState * , collapse * , expand * , isExpanded
	isDescendantOf method
	Use this method to find out if the current object is of a given `typeName` or inherited from it. Type: (typeName: string) => boolean Parameters: typeName, type: string , One of the values listed in the getType() description. Implemented in: Base See also: getType
	isDesignMode property
	Returns `true` if the survey is being designed in Survey Creator. Type: boolean readonly Implemented in: Base
	isExpanded property
	Returns `true` if the survey element is expanded. Type: boolean readonly Implemented in: SurveyElement See also: state * , toggleState * , collapse * , expand * , isCollapsed
	isLoadingFromJson property
	Returns `true` if the object configuration is being loaded from JSON. Type: boolean readonly Implemented in: Base
	isPage property
	Returns `true` if the survey element is a page. Type: boolean readonly Implemented in: SurveyElement See also: Base.getType
	isPanel property
	Returns `true` if the survey element is a panel. Type: boolean readonly Implemented in: SurveyElement See also: Base.getType
	isQuestion property
	Returns `true` if the survey element is a question. Type: boolean readonly Implemented in: SurveyElement See also: Base.getType
	isReadOnly property
	Returns `true` if the survey element or its parent element is read-only. If you want to switch a survey element to the read-only state based on a condition, specify the `enableIf` property. Refer to the following help topic for information: Conditional Visibility. Type: boolean readonly Implemented in: SurveyElement See also: readOnly
	isValueEmpty method
	Returns `true` if a passed `value` is an empty string, array, or object or if it equals to `undefined` or `null`. Type: (value: any, trimString?: boolean) => boolean Parameters: value, type: any , A value to be checked. trimString, type: boolean , (Optional) When this parameter is `true`, the method ignores whitespace characters at the beginning and end of a string value. Pass `false` to disable this functionality. Implemented in: Base
	maxWidth property
	Gets or sets maximum survey element width in CSS values. Default value: "100%" (taken from `settings.maxWidth`) Type: string writable Implemented in: SurveyElement See also: minWidth * , renderWidth * , width
	minWidth property
	Gets or sets minimum survey element width in CSS values. Default value: "300px" (taken from `settings.minWidth`) Type: string writable Implemented in: SurveyElement See also: maxWidth * , renderWidth * , width
	name property
	A survey element identifier. Question names must be unique. Type: string writable Implemented in: SurveyElement
	onItemValuePropertyChanged event
	An event that is raised when an `ItemValue` property is changed. Parameters: `sender`: `this` A SurveyJS object whose property contains an array of `ItemValue` objects. `options.obj`: `ItemValue` An `ItemValue` object. `options.propertyName`: `String` The name of the property to which an array of `ItemValue` objects is assigned (for example, `"choices"` or `"rows"`). `options.name`: `"text"` \| `"value"` The name of the changed property. `options.newValue:` any` A new value for the property. Type: Event<(sender: Base, options: any) => any, any> Implemented in: Base
	onPropertyChanged event
	An event that is raised when a property of this SurveyJS object has changed. Parameters: `sender`: `this` A SurveyJS object whose property has changed. `options.name`: `String` The name of the changed property. `options.newValue`: `any` A new value for the property. `options.oldValue`: `any` An old value of the property. If the property is an array, `oldValue` contains the same array as `newValue` does. Type: EventBase<Base> Implemented in: Base
	parentQuestion property
	A Dynamic Panel, Dynamic Matrix, or Dropdown Matrix that includes the current question. This property is `null` for standalone questions. Type: E readonly Implemented in: SurveyElement
	readOnly property
	Makes the survey element read-only. If you want to switch a survey element to the read-only state based on a condition, specify the `enableIf` property. Refer to the following help topic for information: Conditional Visibility. Type: boolean writable Implemented in: SurveyElement See also: isReadOnly
	registerPropertyChangedHandlers method
	Registers a function to call when a property value changes. Type: (propertyNames: string[], handler: any, key?: string) => void Parameters: propertyNames, type: string[] , An array of one or multiple property names. handler, type: any , A function to call when one of the listed properties change. key, type: string , (Optional) A key that identifies the current registration. If a function for one of the properties is already registered with the same key, the function will be overwritten. You can also use the key to subsequently unregister handlers. Implemented in: Base See also: unregisterPropertyChangedHandlers
	renderWidth property
	Returns a calculated width of the rendered survey element in CSS values. Type: string writable Implemented in: SurveyElement See also: width * , minWidth * , maxWidth
	rightIndent property
	Increases or decreases an indent of survey element content from the right edge. Accepts positive integer values and 0. Does not apply in the Default V2 theme. Type: number writable Implemented in: SurveyElement See also: indent
	setPropertyValue method
	Assigns a new value to a specified property. Type: (name: string, val: any) => void Parameters: name, type: string , A property name. val, type: any , A new value for the property. Implemented in: Base
	state property
	Gets and sets the survey element's expand state. Possible values: `"default"` (default) - The survey element is displayed in full and cannot be collapsed in the UI. `"expanded"` - The survey element is displayed in full and can be collapsed in the UI. `"collapsed"` - The survey element displays only `title` and `description` and can be expanded in the UI. Type: string writable Implemented in: SurveyElement See also: toggleState * , collapse * , expand * , isCollapsed * , isExpanded
	survey property
	Returns the survey object. Type: ISurvey readonly Implemented in: SurveyElement
	title property
	A title for the survey element. If `title` is undefined, the `name` property value is displayed instead. Empty pages and panels do not display their titles or names. Type: string writable Implemented in: SurveyElementCore See also: Configure Question Titles
	toggleState method
	Toggles the survey element's `state` between collapsed and expanded. Type: () => boolean Implemented in: SurveyElement See also: state * , collapse * , expand * , isCollapsed * , isExpanded
	toJSON method
	Returns a JSON object that corresponds to the current SurveyJS object. Type: () => any Implemented in: Base See also: fromJSON
	unregisterPropertyChangedHandlers method
	Unregisters value change event handlers for the specified properties. Type: (propertyNames: string[], key?: string) => void Parameters: propertyNames, type: string[] , An array of one or multiple property names. key, type: string , (Optional) A key of the registration that you want to cancel. Implemented in: Base See also: registerPropertyChangedHandlers
	width property
	Sets survey element width in CSS values. Default value: "" Type: string writable Implemented in: SurveyElement See also: minWidth * , maxWidth

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